Seq # 110020010

Korscheltellus fusconebulosa (De Geer, 1778) Species

Last modified: April 1, 2022, 6:29 p.m.

This very rare species has been discovered for the first time in Belgium in 2017 in the easternmost part of the country (LG), where it has a stable population.


Family: Hepialidae > Genus: Korscheltellus > Species: Korscheltellus fusconebulosa
Vernacular names
Gemarmerde wortelboorder (NL), Map-winged swift (EN), Marbrure nébuleuse (FR), Adlerfarn-Wurzelbohrer (DE)
First mention in Belgium
Steeman C. & Sierens T. 2018. Interessante waarnemingen van Lepidoptera in België in 2017 (Lepidoptera). — Phegea 46(2): 31–47. On page 40 (as Pharmacis nebulosa). view page




In this species, having a wingspan of 30–38 mm, male and female have a similar wing drawing with a characteristic marble-like pattern. This species can easily be distinguished from the other Hepialidae species by the chequered fore- and hindwing fringes. The antennae are strikingly short and the moths lack functioning mouth parts so they cannot feed.

Museum specimens

Specimens in nature


The caterpillar is yellowish white, has a reddish-brown head and orange-brown thoracic plates. The lateral sides carry distinctive blackish stigmata.

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The larva feeds on the roots of its hostplant, hibernates twice and pupates in the ground. The adults are active from dusk onwards and, later on, come to light.

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Flight periods

The adults fly from late May till the beginning of July.

Observed on

Host plant (species):
Pteridium aquilinum
Ferns and Grasses

The larva feeds mainly in Pteridium aquilinum but sometimes also other food plants are taken. Also Festuca rubra is mentioned in literature.

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This species prefers open woodland, rough pastures, moorland and heathland.

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